9
For questions 1-6, read the following text and
choose from the list (AJ) given below the best
phrase to fill each gap. There are three phrases
which do not fit in any gap. There is an example (0).
STRATEGY POINT
Read the title for a general idea of what the text will be
about
. Read through the text once, ignoring the gaps, to get an
idea of the content of each paragraph.
• Make sure the meaning of the phrase you choose fits
into the sentence and the text as a whole.
. Check that the phrase you choose fits grammatically.
ction
en's
whe
Escape into
the Future
For decades, time travel lay beyond the fringe of respectable
science. In recent years, however, the topic 0) ...J... among
theoretical physicists. The motivation 1) ...........-time travel is fun
to think about. But this research has a serious side, too.
Understanding the relation between cause and effect 2) ........... a
unified theory of physics. If unrestricted time travel were possible,
even in principle, the nature of such a unified theory could be
drastically
affected.
Our best understanding of time comes from Einstein's theories of
relativity. Prior to these theories, time 3) .........., the same for
everyone no matter what their physical circumstances were. In his
special theory of relativity, Einstein proposed that the measured
Interval between two events 4) is moving. Crucially, two
observers who move differently will experience different durations
between the same two events.
The effect is often described using the 'twin paradox'. Suppose
that Sally and Sam are twins. Sally boards a rocket ship and travels
at the speed of light to a distant star, turns around and flies back to
Earth, while Sam stays at home. For Sally the duration of the
journey 5) ........... but when she returns and steps out of the
spaceship, she finds that 10 years have elapsed on Earth. Her
brother is now nine years older than she is. Sally and Sam
6) ....., despite the fact that they were born on the same day.
This example illustrates a limited type of time travel. In effect, Sally
has leapt nine years into Earth's future.
A are no longer the same age
B depends on how the observer
C are still the same set of twins
D is a key part of attempts to construct
E is essential when any sort of
F might be, say, one year
G has been partly recreational
H was considerably longer
1 was widely regarded as absolute and universal
has become something of an industry.

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